Fault Code: 1145

[JimT]

So I've had a similar problem with my Davco (same as you have). Originally the problem was a missing O-Ring in the TOP fill cap. Recently I had a similar issue with all o-rings intact. I bought a new Davco unit, the whole thing (comes with a new filter too), for about $230 from the Pete dealer. I think my plastic housing is deformed as it needs to be way over tightened to seal properly. If your unsure about your Davco unit just replace it, it's fairly cheap compared to most parts.

Not sure if it will actually fix your code related problem though. Your rail pressure loss is post fuel pump, which shouldn't be related to the davco, unless you have 1 or more valves in the system that are no good. More likely rail or injector related.